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1 Incomplete metamorphosis: a change in body form with three stages: egg, nymph, and adult. 2  Nymph: young stage of insects that undergo a partial metamorphosis; similar to the adult except that wings are not fully developed.nsects that go through three stages of change in their life cycle have an incomplete metamorphosis while complete metamorphsis has four stages. The first stage of incomplete metamorphisis is the egg.
Others again consider that the whole cycle is a metamorphosis which, beginning in the Heterocotylea as a direct development, has become complicated in the Holostomidae by a larval history, and finally in the Malacocotylea has acquired additional complexity by the intercalation of two larval forms, and is thus spread over several generations.